dealloc，使用释放或设置为nil的属性？ [英] dealloc, use release or set to nil for properties?

问题描述

当我们在实现dealloc的时候，在书中和网上看到各种各样的代码时，我注意到了一些混乱。我的问题是当使用@property我应该使用以下哪一个。直到现在我一直在使用VERSION_001。

I have noticed a little confusion when looking at various bits of code both in books and on the web when it comes to implementing dealloc. My question is when using @property which of the following should I be using. Up until now I have been using VERSION_001.

@property(nonatomic, retain) NSString *name;
@property(nonatomic, retain) NSString *type;
@property(nonatomic, retain) NSString *payload;
@property(nonatomic, retain) NSString *orbit;

VERSION 001

VERSION 001

- (void)dealloc {
    [name release];
    [type release];
    [payload release];
    [orbit release];
    [super dealloc];
}

VERSION 002

VERSION 002

- (void)dealloc {
    [self setName:nil];
    [self setType:nil];
    [self setPayload:nil];
    [self setOrbit:nil];
    [super dealloc];
}

推荐答案

除非您不使用 @synthesize 关键字。当您将属性设置为nil时，它们将由安装程序在后台释放。现在，与第一版本相比，可能会有轻微的性能提升，因为在后台没有太多需要发生的事情（例如指针比较，一切苹果隐藏在幕后）。我总是使用版本001，因为它是更多的点和未来的开发人员不必挖了解我的代码，以弄清楚我完成了什么。

There is no real difference, Unless you are not using the @synthesize keyword. When you set the properties to nil, they are being released behind the scenes by the setter. Now, there may be a slight performance increase over the fist version, because not so much needs to happen behind the scenes (e.g. pointer comparison, and everything else apple hides behind the scenes). I always use version 001, because it is more to the point and future developers don't have to dig though my code to figure out what I am accomplishing.

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